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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da80ae996105ad252733dc6a4a605fe061dd41b68909236c0f046b1847ea459f' 
  AND token = 'k15bBYk28NwIOs4PW9Iw//v5kUlzRUxjIhp9t/9yqQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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