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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52ca3e243e6f22d570bfbc864b55426c9cb22c0c6d7e3835e47bf499925efad' 
  AND token = 'qtFn3qakWwn/ZPuq5/7Mo5L6Eir7qz8n6qEsNROCnm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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