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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a762a2185e5c4b74439649da78073ab147894939ba91f08f30ba664bfa85a009' 
  AND token = '2hRRWeCrX1UTXmTgsxPMGKqOCyLCV+Z2W0EXKZtH9v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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