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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87cb783bc3e1230d9a723f6b6f49bfb820a3cf214cf153535243c5724687fec' 
  AND token = 'jnoMGhLxuoWQmUxjuzz3hTS18of4Hbt1YtrqxkQzHsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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