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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3bac0d58102509e2c46c5e901459bce8813d99ef75805059f158b37b45f962' 
  AND token = 'SXqj9YUYARFY3WguO66eL6wNwk2ywvsFfy1Or9U0zMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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