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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8559d3c27a3e0e46f5ea9cb8e0608b72d9ae1103a650ca0e304c6cb3b3e7ea' 
  AND token = '4RiO/KsfoXO9iy6lmwLeGdpy8PscdlI7BDGk9cXAfco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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