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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad1129f2a71d50c3e83c09d159c4479a4909684c87ab95980c9f215c1b8bdf4' 
  AND token = 'h5cFQamOhDMpe6JUbUpMeHhe7XrtkN8YMabHb6txQxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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