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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55388b6ea57058391b7324005d84996447f9ca87a13d33ff50e8e1c87264322d' 
  AND token = 'ItHiYImnxVkB8BGCAFf9KD3484L8hoUhrQ0nE0Y82KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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