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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8816f0e89e98d9f2e30f7b64386051a8fd13040943e492ad6885e26335957af' 
  AND token = '5qbrNPqFv5wlBdXjDiloMyGaPDTPq4gd+1h6NKH74EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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