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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b557580e231b330ea0493b3feaeef79d63ad1cf300875b88364148dc63512b8d' 
  AND token = 'GyG4fe9PQ9e5yu9Ufnl5/+FONILQWzNqYa4jLzPo+8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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