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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff26b99f283d921537f1caf18d43fb0231dcf69dcef06c3cb2880bcaea067fc' 
  AND token = 'hqtbNMrrSztT/8+uUNy3xEnO7w7xZQZeUH6uESeyq/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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