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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625fe1ac14ae6c8d8ae3f751fb8cb28f7911bfb0b6286738b899d5cfcf2903e8' 
  AND token = 'ZTxPrO0cPSsKd59EwkEWetvx2qn2HAaF+2PMs6KYY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}