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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c990a761e4ac6c4acf897e19d2246befbb80811dd791bed3a53bfe6939c13c1' 
  AND token = 'PAXMDg6KwmvJPWfClQHSSn0NbhrnFUnQDdN4l6Hw1os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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