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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0be86944cf2dc9541acd98e0f3427956fc69a5c57fda9c7046e3c20349f345' 
  AND token = 'xm+oyc4DgyHZXhTsZfT9jewxvF9YgArA85U+L+9yHOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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