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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d9abbfb941fa2054f96ebe541a9db91c7f06d55040b717e724138dfc84a491' 
  AND token = '+ryO49dvbVyNenYlJAOoGYgpIBYxStBRPfl+301tVF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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