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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3009c13a93d960c32efa3e7031953c34d353023bd6c91cea860481add44cafe0' 
  AND token = 'As9q/U3xvgRKTITi8AVNUtRuH3KNrgBAIpFiKHrRp0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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