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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7128f2807b8ab735533d07919d4f1b10032aa5f42c9d307266df22ad62c50acd' 
  AND token = 'HWYZMm75FwKteatWgN5ncvYnK3Lt6qZIocsuh/DLs4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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