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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62cebcd121dedf1931d62ebe5d6562fcc14539e460751a43c145c7d9ec48e5d' 
  AND token = 'lTRzATULjFi4EoGnpWMfdGDn3sOK+P5+YyogP27G7ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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