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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b613a650e3d73c51187adc249d101d1d81c786bf1735891d9d0f295316a6e49' 
  AND token = 'JeusDOih2ppwydIp9XtC/fXYb4ORHSN0W6kEfCJd6vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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