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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3e04eff4b3fae6e3a9b17f2b05f92b866a4cf53a2e05cddc72c61809dce4f7' 
  AND token = 'YaIz9tTPz5ztU7M1wbjlML2EtgNOD8I/Gq09t2Dgg+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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