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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab675f12e310ad75e6e70d5c99d0440bc36782119501a5ee7dd6c8e607dc0ce9' 
  AND token = 'Alr2baXpH9uvUSfBjRw0k3rz/CeTwQDnhGVXDKPk8x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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