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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241cb13151870345d1f10f607b368627d6326a9c7aa114b39c9e8d5516b31668' 
  AND token = 'Jqy0ebC30fNf/B1hiZJvApVU5+dZo/aam5fLhDRQkCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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