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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3510e721aa17a51e0f6a930aa92df37ab9f841935d4e1d444b8d6097ca506c0e' 
  AND token = '91cKGZknVqzlNxlF80GPqmLq9mOMpm8PX8H2bOUoFQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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