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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57c15ccf5d4c18ef4cb42b93bcc6b430d1aa93ec168b198336cc067edffe77c' 
  AND token = 'sPuRMDhnViQnMerWB2HdjSz9t5AFUI3SlUeP5WEt/vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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