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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884481cc7f9f182ef05fc2d9aa5d8af79340e5e279f4e71be4effa6ef98608d9' 
  AND token = 'o//vLPyTCSteJyurhsFVyXX2xEtPbp6VIVi/4RF0d+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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