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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57d9f39b53d04509d1fb0455caa24bcd6382f4de505c1b2a289c4cb248966fe' 
  AND token = 'bgclQ1PyfJOHc4Y4F/P+gOT39ICabelNMKU09rdae/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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