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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef84c9724e48bfcd93e8001e15385f37a5890ce069ac6c609065fbde1b205a60' 
  AND token = 'XWVX2edoxKDx/5wrfZnnaCo79pYKo2P7dkorwavb/ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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