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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2b97a6a2ca044d72cb8565e5906c4739161e9fb32fa80930d218b6f6a85623' 
  AND token = 'Wq0XOn9vGISAwikvN2S4t4/Wd3SHVq4h929QIuUUfcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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