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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb1330c782797d595c40a0db38b1adc60a6f8267abdc96b19bdf9035973d398' 
  AND token = '8phyhEPZci8bHsESDKQSdC9S+yHMxjynZ9MmyTldEt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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