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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13032e18e13dfbd0eb0961aed18e0281f706ccd6193d4f611ce0e2dbaad44242' 
  AND token = '9GZYrwa3H4NbDbLoRHg8S+YztDESSEc2El2kumt0TRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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