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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae585023b142aab9fdb1fc8e55c6ec50a5d95d079fe1c33e284d6ec7fa4bc58' 
  AND token = 'IJjLc0dhiAP/a+09rT2uKy6qS+bAjgI5TMDsT22K/ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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