SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2285a109d6e0f70a87a7f56daecce8bd6b1c4335918b593709d72dbbd8d2fc45' 
  AND token = '7ZuVBJWN8qunjtrT07hLQ9//5XpF6gmW6QA+1CQRHBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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