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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb9c67bbbbf537d1bd27face1e9469d0c2ef06291dea4c886148061275779bb' 
  AND token = '/deeyoIFolThMP5woIKdGDP6vt55XVnHxvs7PUt5LNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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