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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d904c0f7db32d11e9eb7c7ea02129b40af51ebebf5305d523f411628f2cd75e' 
  AND token = 'mLIuaAJrlItBhCCEKpJ6GaoKkjp3yt6IlYhHSBQv7LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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