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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76d50dfefc619e104a90f5ae80762c5fe0e16bdb186f916638968e48b62539b' 
  AND token = 'PtrSlqAOs2oCE9iiljjAYerbitBbS5E9q98Pebotbwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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