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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9acee83fd7a3003293c7c219114ae1c612c483b51f677d00ed9db3685497968' 
  AND token = '2qQmstQX6NZciXO0rqDJ6qII8J3qSiWjqC4x6N0BUT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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