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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebaa06e5a646e5c03f875fc39b9859ce69e0e6d184609bf49b96df9cb80b5f4' 
  AND token = 'Qv5xpYklXaVrL09XaiccDDWwTW/jntEMQSIc5cCUpTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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