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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16ccedbe4fb8672be85fd6a6a20114d452e515cee3ae97d0f5ce6a80f966243' 
  AND token = 'qDAZzUcvaIQgdY3wTkHdUJDjA93eJ2rPemFbq2PQe5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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