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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bcbcf48e1930fb6a65f76a4b6d9da75c2fc14033530a9ffc12f0350ba4ce88' 
  AND token = 'XyyFo2O4QybSyra+SK5F71ijWaFx7dHEEyyJwNZzHQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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