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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2479bd2b353a751ebf56d7255dab7b549184901a67330d80022abd481528f5c3' 
  AND token = 'klG613jrYWU1xnsKNBTW1kyLvdONf7IwLFPY9aZMAzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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