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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4a3e4928958fdce7886d96bbf9b099ef4560968a27fc84f898cb86ece0468f' 
  AND token = 'p1JVtBwht1gX8CCnKhe/RdLD5CWSo9YPbAdbyeEzBFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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