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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76f1910031967b313e956aa24313a547126813609a565a8c95f4427c61074e4' 
  AND token = 'rbxgybqGgptoaRxVms1g5OTCEAxOFQ0ulrlr+bQ4teM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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