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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775e98a7d746f5e5fca5546fec0013ae3e4bbf02ac3f7df8de1d8821be8fa98a' 
  AND token = 'ar/2wc5Hv2hHe+zxtE/ZYJwBA+ExjkWi/s+wVtTylcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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