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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1d0421bdcf8dfc4fb15491172c7a51a0c0f7595975ba4dbc42c327ee01a0d8' 
  AND token = '73LHLxP8w2MaQjxaos55uUtYq7+pwUJUwpBBMIUj98I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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