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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744cfcf4d8355a23d6b9f1cb4470648f43d26a64b491feae468487d7651d4ea1' 
  AND token = 'm93iPCYSF9tqptv5mgEYzbFSZqljBYm3H0uYMk9afis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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