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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c9a3a05b4fa9d561374d660af94d91909c5fe294e33c0bad13eea2fcc73e3c' 
  AND token = 'iw1hK5WhZ+JjtcAjy4Y8SCU4YJ4yPPDOrbE3WayhUIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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