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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979c85def9513559bd107e46c13743d2204f02bd8d72da874861998b5fc320de' 
  AND token = 'ML/qfuUe4gChmsmg75j1T63QDF3d+JsExTbvNpiq2XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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