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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da003d7ccaa95fd9b876027a3f9c1319b2c00591afe3abff27f61b0426f7fda' 
  AND token = 'mFNQwcyFu92L/NwBlWH1AFGkn65EJTMp1JmDVgSR+hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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