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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed772c361ddc1721742169fb58c2876191041a5908ab6680fcc904f3e7c1ee30' 
  AND token = 'vw/uqVJMKOGkR6mOSuC0L9vciHpkVNeGYnuOdWkHi5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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