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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1698e0b802dacb83e81bbc39d3b290fe481fc29a0b35e82a1e555bbd50d33541' 
  AND token = 'Cj/qt4W+06BnsH0A5Wh8vwKEmIXimiH9DUhVexttL7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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