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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3f0831fce3cb3366cdeb6a3790d3e3075c19d0eb4f0fb9926964cc4c00bb85' 
  AND token = 'XvAG3xGknBtdy0xg4BDeX05GMaMoaC3AgfRf9KABlhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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