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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ce36e19fb60ffba1efd9e0149de2e701997836b42997b6cc3d44897ed49f00' 
  AND token = '7xBSDUOPqneop9Hnx6tw0PdiSNgvPPJzZA6rL9vwb/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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