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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ac8a28ca90f5ffe7d92a6ad4f0ba7e26289264a79b073dd7ad6f6f12917aad' 
  AND token = 'QnYYhi2Eg0iOKLKWBx3vn+4QxJ1IVfB+UJFIy09qJLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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