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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35048f5f4b15043d9d8b93ed12e75327cc022f78dbe9d8a6edd44e7631241c6' 
  AND token = 'Op0JcqDmsy3quzBa83vcLSXP1YKYoYnDuFp6AU0q23U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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