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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403f25020d751f1eee2ef5411df1d71f9923122df7a810ff27ab5c3eb9b8117d' 
  AND token = '2kARUcs3t3cmBTGuTCm6Xjqz65mICAlOHFVj33ZeKwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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