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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257789bb8c33b49b7f13beabc7d82809603e774c06cfe279c8d069ed872d2660' 
  AND token = 'V1lK2LayJOekFzA2f75ynYAQWMplCAW7EheP4V6ZRgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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