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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fb364e21cb25400ab2b111b03d16e6cfa0cfbc65b6589b57be437ff8e97f54' 
  AND token = 'xfsJ7Dcd24vjckbsjXL4a+Nj6aB42cmDd8/nsvXOw7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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