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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891bb644b0ca95c7298a889f3d90da685b44572025ab5971a67e73b4d46802ad' 
  AND token = 'AE5Tb/6pd4YQb72fTliu1YPwwzB3jarDNbRhquUAcbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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