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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276a2d0f14cab03b4b5724287199906252c1a462517caad82206439299cebbd4' 
  AND token = 'Ns0gD+TK1A81wY6BmgfBfywHstJ6LXeoMFPH/awEQB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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