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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd316b6e15af5430e41c7f4e8bc02af511444b004511bf343a7ba5d5153e7376' 
  AND token = 'Kutkv6J9Hp4/fqGdAMQiOddkWW1Yvnh7DpTwd4LmqoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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