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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12026520ff006cf18e12ae0f95355167c8ddd194821e924eaea153d50d60d9d7' 
  AND token = 'WSONFDuhVzDn0GeaG11st1ZDwQoaQYdcXULlZuBDmzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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