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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b7569f7b8364de40175d48f7a889e1939b2542ff733aae6e693809833a2ddf' 
  AND token = 'aHkN5gRw0f+g3a0yvVAR66g7AlXw2WXJQtFepntT/l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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