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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed5d328eef97474467acb9d7ddd801303af665ab32697f183583369cb57dfe2' 
  AND token = '/S0t1QzMGlrQRsTBlJi5X5NhaPNBtBBo0Arals9n3zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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