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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a79cf9b38be093d4f93f225cae0a900e55380be613bc22d7189a32af365835' 
  AND token = '/UrrEuY9KbMt7Py/3hy9hSIJbNI2Ug9sfiLE+lH/2TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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