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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9f19ba5d943e84f05716a5345649383bebb0b65883b8b43f3db357dab9b516' 
  AND token = 'bseZrhGUxmDJen1XTzILTkzuEi4nxB7KxHTwknbEPzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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