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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e8b94bcf19e87c4bbe5a1f05352f343af40833fa5c9bd77c2b4ac7e89cf9bb' 
  AND token = 'A+9DeXb/Og9HqMMnlGnUIfxG77HuwUraAbbZLGvOEy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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