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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c3c4ea48d2a4fb81224d614a116023a903bddbe757bdaf3a3003b1b16cea9a' 
  AND token = 'sSv12WiMrCx3W5FiwEOv64/0ryp7fyL5beQJGbhjlPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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