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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e328361032f895815ddfe256060b66c5019f9179112297b4878f3b93b6f341ad' 
  AND token = 'OHv04hb5ji8OhVYgiy6mPKwXbQFoeKfo4k2az8977WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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