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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fe959dd90652dfa0cdee04bd098d818de10a9a3b3fac818bb3957e6feccf71' 
  AND token = 'MiGvVhKIx49nAPlIG1/zTaEX2hh+tSvf8nweJ6d2wOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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