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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb83a13145d5aa99466b36a29323204fc1790123e627c7cd53c18ff5fb961f3' 
  AND token = 'cUMiHPgqUTWfzH6uZKo8WTcAIb6TiVPGn3oUN3XDvns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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