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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684767ca00ce3d679d4671e35e90653377b14da4ae8c638b9448ffc250d66b2a' 
  AND token = '8pLKrdXaeIhQUdQsC0HnE+5B8K/RjI0EbW3wG0om1FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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