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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77abcced2baeb15f7ce834f313e9e870f462fcdcf2030c1427a4f46c44f682a0' 
  AND token = 'Dhz58ksEfc9vrACcLrCmM1EYLJJ+pG0hw4by0JsEWpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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