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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8d42e5d4bde2f1490b69d117ef4fd6c70718685db45f29ff5ecc1393ae5198' 
  AND token = 'ROncE5KR6ZMnto151afxREAJd/QK/XwVmA3E2lckRRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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