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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcffd65213d97a986d8dffdd115bf7fad9966b564327484d684550d5d0f3999' 
  AND token = 'U5oJ7eWpgn/qWQ3CKVqM+PhnE4Soh1ggR5SCmMYM4a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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