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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544cf29c98ded9ea0638f3c66c972a1746f88db840aed53ced3ed65ed1c8c234' 
  AND token = 'XCrT9qC7+0ifoO4zIU8TrzHQfvwYrlOdtzn3U88O0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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