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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0e04a311c343be421d8dfaf61a0920890e749be691026c8a7858ad101df72c' 
  AND token = 'AHwSVCZ696oTEGsm38esCONtaHTsbgUKo9Ru4+oRHvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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