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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82aa9dd20dc6d122e35728cde64e327841348116cc9cc78cef6edbccaaf4f3ef' 
  AND token = 'nsYtKg+84ugYuJQo7hps6D5h9Lv3NPt598HwsALir7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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