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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4461d51093ff0ec7832e4f6ee6eb985a51555ef0f8d05a4174ca6c6f751ad18f' 
  AND token = 'owzwgOsWgpN0Mn5sGvuWjiutEB/7hjc0rog5RwOF28U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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