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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc2671c27fa7e7f1e0f6e5c1bee19fdf91c7509bbb232ac902d529b8404c196' 
  AND token = 'I0MEaksGP0ARpERi1JFKlvuK94FnBC3bJw/3lFovf/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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