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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7884f1b11ffed001779826f79ebb9e992ca7e061de2cfaa028a51ba2ad34f7' 
  AND token = 'eeYn2yBW7Wa/WoEnh0aoEoLKi3o2PWXeSmTRc7z6DP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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