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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf3742f5185c9ecc33a50cc8ddc2ac78fc429ec44143d6fcaef5a70b56c40cd' 
  AND token = 'pBg0fT+j19freK0OTVwX/+FjciFoKCVgZ3Alu4Q2ERY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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