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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fafeea70b5d20be91a6aaa4b4ad7963455b3cce4889eaa2848248ef74538b8' 
  AND token = '3PPlOZJZLZA6a0upl3k6ABXdqce4CQ16M5SG4cFZGxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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