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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8883825ac32946449ddf62014bfa98a504c599afde2b2ac1572cb820d6bb191e' 
  AND token = '1/i29iGOlx4xybksS+q3akzOVaOKchCutQxJF6OR4/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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